And now, the main thing! As far as I can see, my next work will be called "Human Bisexuality." It will go to the root of the problem and say the last… - Sigmund Freud

The element of truth behind all this, which people are so ready to disavow, is that [humans] are not gentle creatures who want to be loved, and who at the most can defend themselves if attacked; they are, on the contrary, creatures among whose instinctual endowments is to be reckoned a powerful share of aggressiveness. ... It is always possible to bind together a considerable number of people in love, so long as there are other people left over to receive the manifestations of their aggressiveness.

"Experience teaches that for most people there is a limit beyond which their constitution cannot comply with the demands of civilization. All who wish to reach a higher standard than their constitution will allow, fall victims to neurosis. It would have been better for them if they could have remained less "perfect"."

La ciencia moderna aún no ha producido un medicamento tranquilizador tan eficaz como lo son unas pocas palabras bondadosas.